The general operation steps of cold insulation inspection of electric heating tubes are as follows:
1. Prepare tools and materials: insulation resistance tester (or megohmmeter), wiring board, insulation tape, gloves, work clothes, etc.
2. Check the electric heating pipe: observe the appearance of the electric heating pipe to confirm that there is no damage, no deformation and other phenomena.
3. Disconnect the power supply: The power supply must be disconnected before operation to ensure safety.
4. Connect the insulation resistance tester: connect the insulation resistance tester (or megohmmeter) to the terminal of the electric heating tube, pay attention to the positive and negative polarities to be connected correctly.
5. Measure insulation resistance: adjust the insulation resistance tester to the appropriate range (generally choose 2000 volts or higher), and then gradually increase the voltage, while observing the reading of the insulation resistance tester and recording the stable resistance value.
6. Reduce the voltage: gradually reduce the voltage to zero, and then disconnect the insulation resistance tester from the electric heating tube.
7. Analyze insulation resistance value: judge the insulation performance of electric heating tube according to the measured resistance value. Generally, the cold insulation resistance value is not less than 1 megaohm (MΩ). If the resistance value is lower than this value, it means that the electric heating tube has poor insulation.
8. Record and report: Record the measured resistance value and report it to the relevant personnel or department, including the model, specification, use location and other details of the electric heating pipe.
9. Safety measures: During the entire operation, necessary safety measures must be taken, such as wearing gloves, work clothes, insulating shoes, etc., to ensure the safety of workers.
The above is the general operation steps of the cold insulation inspection of electric heating tubes, and the specific operation should be carried out according to the product instruction manual or the guidance of professionals.
